Opened 14 months ago
Last modified 14 months ago
#10578 new defect
send RTSP keep alive even when paused
| Reported by: | tmc2001 | Owned by: | |
|---|---|---|---|
| Priority: | normal | Component: | avformat |
| Version: | unspecified | Keywords: | |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description (last modified by )
Workflow:
- Have a RTSP server that supports Pause.
- Have ffmpeg play a video from that server (rtsp://<ipaddr>:...).
- Pause the video in ffmpeg (call av_read_pause)
- ffmpeg does NOT properly send the keep alive when Paused (either "GET_PARAMETER" or "OPTIONS"). This is the bug.
- Since the RTSP server expects the keep alive, after the specified timeout (usually 60s) it closes the connection.
The bug is in:
File: libavformat/rtspdec.c
Method: rtsp_read_packet
This method first does ff_rtsp_fetch_packet, which fails when the server is Paused, causing it to never send the "GET_PARAMETER" or "OPTIONS" which is placed immediately after this call.
Potential easy fix:
Simply move that block of code before ff_rtsp_fetch_packet.
That is, move the entire if block:
if (!(rt->rtsp_flags & RTSP_FLAG_LISTEN)) { ... }
just before the call to:
ret = ff_rtsp_fetch_packet(s, pkt);
I have tested this and it seems to work well for our cases.
Sent this to ffmpeg-devel mailing list as well:
http://ffmpeg.org/pipermail/ffmpeg-devel/2023-August/313608.html
Would appreciate if an experienced DEV would approve and integrate into ffmpeg.
Thank you.
